Cauliflower and Caramelized Onion Tart

Cauliflower and Caramelized Onion Tart was pinched from <a href="http://12tomatoes.com/2014/03/vegetarian-recipe-cauliflower-and-caramelized-onion-tart.html" target="_blank">12tomatoes.com.</a>
INGREDIENTS
1 refrigerated pie crust or homemade tart shell (click here for a recipe)
1 large head cauliflower, cut into florets
1 large yellow onion, cut in half and thinly sliced
1 8 -ounce package mascarpone cheese (substitute sour cream for a lighter version)
1 cup grated Gruyère (or substitute Swiss OR fontina/Parmesan combo)
2 tablespoons grated Parmesan
1/2 cup heavy cream
2 large eggs
Truffle oil (optional)
Olive oil
Dijon mustard
Pinch of ground nutmeg
Salt
Pepper
Sugar
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